diff options
Diffstat (limited to 'vendor/simplepie/simplepie/src/Content/Type/Sniffer.php')
| -rw-r--r-- | vendor/simplepie/simplepie/src/Content/Type/Sniffer.php | 222 |
1 files changed, 213 insertions, 9 deletions
diff --git a/vendor/simplepie/simplepie/src/Content/Type/Sniffer.php b/vendor/simplepie/simplepie/src/Content/Type/Sniffer.php index 574912e8e..c74b0885e 100644 --- a/vendor/simplepie/simplepie/src/Content/Type/Sniffer.php +++ b/vendor/simplepie/simplepie/src/Content/Type/Sniffer.php @@ -5,10 +5,7 @@ * A PHP-Based RSS and Atom Feed Framework. * Takes the hard work out of managing a complete RSS/Atom solution. * - * Please note: This file is automatically generated by a build script. The - * full original source is always available from http://simplepie.org/ - * - * Copyright (c) 2004-2016, Ryan Parman, Sam Sneddon, Ryan McCue, and contributors + * Copyright (c) 2004-2022, Ryan Parman, Sam Sneddon, Ryan McCue, and contributors * All rights reserved. * * Redistribution and use in source and binary forms, with or without modification, are @@ -46,10 +43,217 @@ namespace SimplePie\Content\Type; -class_exists('SimplePie_Content_Type_Sniffer'); +/** + * Content-type sniffing + * + * Based on the rules in http://tools.ietf.org/html/draft-abarth-mime-sniff-06 + * + * This is used since we can't always trust Content-Type headers, and is based + * upon the HTML5 parsing rules. + * + * + * This class can be overloaded with {@see \SimplePie\SimplePie::set_content_type_sniffer_class()} + * + * @package SimplePie + * @subpackage HTTP + */ +class Sniffer +{ + /** + * File object + * + * @var \SimplePie\File + */ + public $file; + + /** + * Create an instance of the class with the input file + * + * @param Sniffer $file Input file + */ + public function __construct($file) + { + $this->file = $file; + } + + /** + * Get the Content-Type of the specified file + * + * @return string Actual Content-Type + */ + public function get_type() + { + if (isset($this->file->headers['content-type'])) { + if (!isset($this->file->headers['content-encoding']) + && ($this->file->headers['content-type'] === 'text/plain' + || $this->file->headers['content-type'] === 'text/plain; charset=ISO-8859-1' + || $this->file->headers['content-type'] === 'text/plain; charset=iso-8859-1' + || $this->file->headers['content-type'] === 'text/plain; charset=UTF-8')) { + return $this->text_or_binary(); + } + + if (($pos = strpos($this->file->headers['content-type'], ';')) !== false) { + $official = substr($this->file->headers['content-type'], 0, $pos); + } else { + $official = $this->file->headers['content-type']; + } + $official = trim(strtolower($official)); + + if ($official === 'unknown/unknown' + || $official === 'application/unknown') { + return $this->unknown(); + } elseif (substr($official, -4) === '+xml' + || $official === 'text/xml' + || $official === 'application/xml') { + return $official; + } elseif (substr($official, 0, 6) === 'image/') { + if ($return = $this->image()) { + return $return; + } + + return $official; + } elseif ($official === 'text/html') { + return $this->feed_or_html(); + } -if (\false) { - class Sniffer extends \SimplePie_Content_Type_Sniffer - { - } + return $official; + } + + return $this->unknown(); + } + + /** + * Sniff text or binary + * + * @return string Actual Content-Type + */ + public function text_or_binary() + { + if (substr($this->file->body, 0, 2) === "\xFE\xFF" + || substr($this->file->body, 0, 2) === "\xFF\xFE" + || substr($this->file->body, 0, 4) === "\x00\x00\xFE\xFF" + || substr($this->file->body, 0, 3) === "\xEF\xBB\xBF") { + return 'text/plain'; + } elseif (preg_match('/[\x00-\x08\x0E-\x1A\x1C-\x1F]/', $this->file->body)) { + return 'application/octet-stream'; + } + + return 'text/plain'; + } + + /** + * Sniff unknown + * + * @return string Actual Content-Type + */ + public function unknown() + { + $ws = strspn($this->file->body, "\x09\x0A\x0B\x0C\x0D\x20"); + if (strtolower(substr($this->file->body, $ws, 14)) === '<!doctype html' + || strtolower(substr($this->file->body, $ws, 5)) === '<html' + || strtolower(substr($this->file->body, $ws, 7)) === '<script') { + return 'text/html'; + } elseif (substr($this->file->body, 0, 5) === '%PDF-') { + return 'application/pdf'; + } elseif (substr($this->file->body, 0, 11) === '%!PS-Adobe-') { + return 'application/postscript'; + } elseif (substr($this->file->body, 0, 6) === 'GIF87a' + || substr($this->file->body, 0, 6) === 'GIF89a') { + return 'image/gif'; + } elseif (substr($this->file->body, 0, 8) === "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") { + return 'image/png'; + } elseif (substr($this->file->body, 0, 3) === "\xFF\xD8\xFF") { + return 'image/jpeg'; + } elseif (substr($this->file->body, 0, 2) === "\x42\x4D") { + return 'image/bmp'; + } elseif (substr($this->file->body, 0, 4) === "\x00\x00\x01\x00") { + return 'image/vnd.microsoft.icon'; + } + + return $this->text_or_binary(); + } + + /** + * Sniff images + * + * @return string Actual Content-Type + */ + public function image() + { + if (substr($this->file->body, 0, 6) === 'GIF87a' + || substr($this->file->body, 0, 6) === 'GIF89a') { + return 'image/gif'; + } elseif (substr($this->file->body, 0, 8) === "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") { + return 'image/png'; + } elseif (substr($this->file->body, 0, 3) === "\xFF\xD8\xFF") { + return 'image/jpeg'; + } elseif (substr($this->file->body, 0, 2) === "\x42\x4D") { + return 'image/bmp'; + } elseif (substr($this->file->body, 0, 4) === "\x00\x00\x01\x00") { + return 'image/vnd.microsoft.icon'; + } + + return false; + } + + /** + * Sniff HTML + * + * @return string Actual Content-Type + */ + public function feed_or_html() + { + $len = strlen($this->file->body); + $pos = strspn($this->file->body, "\x09\x0A\x0D\x20\xEF\xBB\xBF"); + + while ($pos < $len) { + switch ($this->file->body[$pos]) { + case "\x09": + case "\x0A": + case "\x0D": + case "\x20": + $pos += strspn($this->file->body, "\x09\x0A\x0D\x20", $pos); + continue 2; + + case '<': + $pos++; + break; + + default: + return 'text/html'; + } + + if (substr($this->file->body, $pos, 3) === '!--') { + $pos += 3; + if ($pos < $len && ($pos = strpos($this->file->body, '-->', $pos)) !== false) { + $pos += 3; + } else { + return 'text/html'; + } + } elseif (substr($this->file->body, $pos, 1) === '!') { + if ($pos < $len && ($pos = strpos($this->file->body, '>', $pos)) !== false) { + $pos++; + } else { + return 'text/html'; + } + } elseif (substr($this->file->body, $pos, 1) === '?') { + if ($pos < $len && ($pos = strpos($this->file->body, '?>', $pos)) !== false) { + $pos += 2; + } else { + return 'text/html'; + } + } elseif (substr($this->file->body, $pos, 3) === 'rss' + || substr($this->file->body, $pos, 7) === 'rdf:RDF') { + return 'application/rss+xml'; + } elseif (substr($this->file->body, $pos, 4) === 'feed') { + return 'application/atom+xml'; + } else { + return 'text/html'; + } + } + + return 'text/html'; + } } + +class_alias('SimplePie\Content\Type\Sniffer', 'SimplePie_Content_Type_Sniffer'); |